contact: Nice to see that solved your problem

and the results look promising, hope we get to see what you're creating there soon.
Pawel: Oh that stacked stonewall looks good already

good work so far! now to create those sparkling crystals in that stonematerial hm, it's a bit difficult as i first of all think those types of stones are quite diffuse with only a minimal amount of specular highlights on them and i also think it could be tricky to create a map that would show up well on that . Anyways, basically what you could try to do is create a map with what would represent tiny crystals of different sizes, greytones and intensities (obviously) and add that to a secondary layer in your material then boost it's nd value alot and add some reflectivity and that's about it.
But if those sparkles will show up that's a different story once you create a scene outta this or use it elsewhere but in the materialpreview render, i run into some issues with that myself today so i dropped the project for today to give my braincell a rest and resume work on it tomorrow. However you may be more successful than me on this, i just think you chose a tough material to add such small barely visible things to. I think they will dissapear in the rest of the colorful rockwall you got there.
Btw, this one is for the contest isn't it Pawel ?

o and isn't this your first contribution to the displacement thread ? then welcome to the displaced thread hehe
/ Max